/Engine/Source/Runtime/MovieScene/Public/MovieSceneCommonHelpers.h
Helper struct to cache the package dirty state and then to restore it after this leaves scope. This is for a few minor areas where calling functions on actors dirties them, but Sequencer doesn't actually want the package to be dirty as it causes Sequencer to unnecessairly dirty actors.
struct FMovieSceneScopedPackageDirtyGuard